The Cisco CRS performance route processors (Figures 1 and 2) run on Cisco IOS® XR Software, a fully modular and distributed internetwork operating system that uses a memory-protected, microkernel-based architecture and control-plane distribution that allow the system to scale.

The performance route processor includes a pair of solid-state drives (SSDs) for fast software installation and boot-up. Like the ECC memory, which protects against memory errors, the dual SSDs guard against drive failure by mirroring the boot partition that stores the Cisco IOS XR Software.

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